Join Date: Feb 2010
Location: Brookville, OH
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'97 7.3 Crank/No Start
About three weeks ago I believe I experienced my first CPS failure. Going down the highway and truck started to shutter and eventually died. Would sometimes restart, but struggled to stay running. Pulled codes P0340 and P0344 on my scan gauge. In a pinch, I made the mistake of buying a "parts store" CPS for my replacement. Ended up resolving my issue and on my way I went.
Drove my truck into work Saturday morning with no issues. Went to leave that afternoon and truck would crank and crank but no start. Tach would sometimes move and sometimes not. Checked harness for CPS from around the alternator down to the sensor. Have not checked between that point and PCM. Checked resistance of ground wire and voltage of power wires, to find they were all correct. Located a Ford/IH black CPS Saturday evening from a friend with plans to install Sunday morning. Sensor was used but was said to be working well before removal from truck. Looked like the sensor had been installed for some time. Before installation of sensor, had both P0340 and P0344 codes set again. After installing the black sensor and reseting DTCs, the P0340 code went away but P0344 remained. Truck would still not start, with tach showing up only sometimes. I have been told P0344 will show up if you have been cranking the truck for a long period of time. After reading, I was told I could have a fuel delivery issue. With a little looking, I did happen to find that my ground wire for the relay for my e-fuel system was about disconnected, so I repaired that. Still no luck. Cleaned the open connections on my frame mounted pump and somehow after doing so my truck started. Ran well and had no issues. I drove the truck home at quitting time with no problems as well.
Sunday evening I take my truck to a buddies house with no issues. I spend a little over an hour there before we decide to leave in the truck. Truck started normal but after about three seconds of operation it just died, as if I shut the key off. Went to restart with no luck. At this point, I would turn the key and not even receive a crank. Ended up driving his truck to our destination and back. Tried starting my truck again when we got back and it fired up first try. Let it run for about five minutes and no issues on my 10-12 mile drive home. Once home I figured I would shut the truck off and try for a restart to see what would happen. All the truck would do is crank. After around the third try it did start. No codes (only P1111) showed up on the scan gauge.
Went to start the truck to leave for work this morning and once again, only crank and no fire. Now only code P0340 was showing on the scan gauge. While cranking I noted there was no tach reading. Needing to get to work, I have not been able to perform any further troubleshooting.
Things that may play factor
-Truck has remote start
-Have not installed new Ford/IH CPS (either used or parts store)
-Water pump failed a few weeks ago leaking out weep hole, which was pouring right onto the CPS. Pulled connector end for CPS apart and it appears to be looking just fine.
Things I've considered
-New connector end
-Brand new Ford/IH CPS
-Rubbed wire in harness
-Remote start messed up
I am almost completely stumped. I'm a little happier the truck is now at least home to work on and not somewhere else. Any and all help and advice/personal experience would be appreciated. I was considering getting a brand new sensor from Ford today just to be sure, but beyond that I am running out of ideas. Thanks in advance!
1997 F250HD 4x4 XLT E4OD SCLB
'05 axle swap w/ 3.73s
, EATC, aFe Big Boost/Full Metal, IH water pump w/ 205* t-stat, CCV, 6.0 fan, SD IC, E-Fuel, Gutted EBPV/blank pedestal, 3" DP, no cat/muffler, 4" exhaust, TS w/ PHP tunes, Hydroboost, Tru Cool 4921, ISSPRO-Boost, Trans, Pyro; Aeroforce Interceptor